Table 1.
Relative levels (fold changes) of VOCs detected in juices of four Citrus varieties.
Figure 1.
Principal Component Analysis score plot (t[1] vs t[2]) for the first and second principal components.
Figure 2.
Principal Component Analysis loading plot (p[1] vs p[2]) for the first and second principal components.
Each number corresponds to a particular volatile compound, as indicated in Table 1.
Figure 3.
Hierarchical cluster analysis of both samples and identified volatile compounds.
Samples grouped themselves by varieties: Ch, Chandler; Cl, Clemenules; F, Fortune; P, Powell. Volatiles grouped in clusters A, B and C, and sub-clusters A1, A2, C1, C2 and C3. Colours in the heatmap mean the fold change, in accordance to the scale in the bottom: red for higher levels; green for lower levels. Colour circles before the name of the compounds describe the chemical family each particular compound belongs to: red, aldehyde; brown, ketone; orange, alcohol; yellow, ester; indigo, furan; pink, aromatic hydrocarbon; light green, monoterpene hydrocarbon; dark green, monoterpene cyclic ether; blue, sesquiterpene.
Figure 4.
Heatmap of the correlation matrix of the volatile compounds.
Positive correlations are shown in red; negative correlations in green; absence of correlation in black.